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[Primary prevention and non-linearity in cardiovascular adaptation]
Insights
The healthy heart
Area of Science:
- Cardiovascular Physiology
- Sports Cardiology
- Exercise Science
Context:
- The relationship between heart size and function is crucial for understanding cardiovascular health.
- The 'athletic heart' phenomenon, characterized by heart enlargement, often correlates with optimized function.
- Previous research has explored this reciprocity, but a comprehensive analysis across a wide range of heart sizes was needed.
Purpose:
- To investigate the functional behavior of healthy hearts across a broad spectrum of sizes (600-1,380 ml).
- To determine the nature of the relationship between heart size and cardiac function under various physiological conditions.
- To identify the optimal heart size for cardiac function and its implications for cardiovascular adaptation.
Summary:
- Cardiac function does not scale linearly with heart size across all adaptation levels.
- A parabolic relationship exists between heart size and functional indices, particularly evident at rest, during submaximal and maximal exercise, and under afterload.
- The optimal adaptation for cardiac function occurs near the midpoint of the observed heart size range.
Impact:
- Findings provide critical insights into the primary prevention of cardiovascular diseases by defining optimal cardiac parameters.
- This research can inform exercise prescription and training protocols for athletes and the general population.
- Understanding the limits of cardiac adaptation can aid in identifying individuals at risk for cardiac dysfunction.
Abstract:
The size of the healthy heart and its function stand in a significant reciprocity. An enlargement of the heart in the sense of the formation of the athletic heart is characterized by an optimation of the function. On the basis of a larger sample the functional behaviour of healthy hearts between a size of 600 and 1,380 ml was tested. The function of the heart is not linearly connected with the size of the heat in the whole breadth of adaptation. When a small adaptation level is present a larger functional change is to be attached to a defined change of the size of the heart than in a high adaptation level. The curve of functional indices reveals a parabolic form above the size of the heart. This situation is present in rest, in submaximal load, in the phase of final load and in the phase of after-load. On the basis of representative parameters of the cardiovascular function this fact is demonstrated. The adaptation optimum is found nearly in the middle of the possible phase of adaptation. The author deals with the importance which these findings have for the primary prevention of cardiovascular diseases.